mycat 路由转发过程原理深度解析

1 安装后进入

Schema.xml配置信息如下，数据节点名称dn1、dn2、dn3：

安装完后登录测试：
mysql -utest -ptest -h127.0.0.1 -P8066 -DTESTDB

2 , 创建表

create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);

3，录入数据

3.1插入在分片0上：

explain insert into travelrecord (id,user_id,traveldate,fee,days) values(100001,'xiaohong','2014-01-06',510.5,3);
insert into travelrecord (id,user_id,traveldate,fee,days) values(100001,'xiaohong','2014-01-06',510.5,3);

3.2录入在分片1上：

explain insert into travelrecord (id,user_id,traveldate,fee,days) values(8000004,'mazi','2014-01-06',510.5,3);
insert into travelrecord (id,user_id,traveldate,fee,days) values(8000004,'mazi','2014-01-06',510.5,3);

3.3录入在分片2上：

explain insert into travelrecord (id,user_id,traveldate,fee,days) values(10000004,'suqi','2014-01-06',510.5,3);
insert into travelrecord (id,user_id,traveldate,fee,days) values(10000004,'suqi','2014-01-06',510.5,3);

4，查询数据

4.1在mycat后台的db上面，路由看到是分在3个片上面，

explain select * from Travelrecord;

4.2单个数据路由分析，都在不同的datanode上：

4.3去实际的mysql上面测试，查询数据，已经分到3个分片 db1、db2、db3上面了，如下所示：